Не за что. Повторять нужно именно согласование времён, а не сослагательное наклонение. Здесь вот такое дело:
She told us: "I am going to the library!"
She told us that she were going to the library
I thought you were a man! I knew he was ill. I thought you were friends. I didn't know where he was. Ну и т.д.
Если наш пример немного сократить для наглядности:
We taught the baloons how to sail where they needed to sail